A layout that can fit system windows or not depending on a flag.

FitSystemWindowsLayout.java

package io.michaelrocks;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.util.AttributeSet;
import android.view.WindowInsets;
import android.widget.FrameLayout;

public class FitSystemWindowsLayout extends FrameLayout {
  private boolean mFit = false;

  public FitSystemWindowsLayout(final Context context) {
    super(context);
  }

  public FitSystemWindowsLayout(final Context context, final AttributeSet attrs) {
    super(context, attrs);
  }

  public FitSystemWindowsLayout(final Context context, final AttributeSet attrs, final int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }

  public boolean isFit() {
    return mFit;
  }

  public void setFit(final boolean fit) {
    if (mFit == fit) {
      return;
    }

    mFit = fit;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
      requestApplyInsets();
    } else {
      //noinspection deprecation
      requestFitSystemWindows();
    }
  }

  @SuppressWarnings("deprecation")
  @Override
  protected boolean fitSystemWindows(final Rect insets) {
    if (mFit) {
      setPadding(
          insets.left,
          insets.top,
          insets.right,
          insets.bottom
      );
      return true;
    } else {
      setPadding(0, 0, 0, 0);
      return false;
    }
  }

  @TargetApi(Build.VERSION_CODES.KITKAT_WATCH)
  @Override
  public WindowInsets onApplyWindowInsets(final WindowInsets insets) {
    if (mFit) {
      setPadding(
          insets.getSystemWindowInsetLeft(),
          insets.getSystemWindowInsetTop(),
          insets.getSystemWindowInsetRight(),
          insets.getSystemWindowInsetBottom()
      );
      return insets.consumeSystemWindowInsets();
    } else {
      setPadding(0, 0, 0, 0);
      return insets;
    }
  }
}